寫一個方法，用來對Bitmap進行高斯模糊：

public static Bitmap blurBitmap(Bitmap bitmap ,Context context){

    //Let's create an empty bitmap with the same size of the bitmap we want to blur
Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
//Instantiate a new Renderscript
 
RenderScript rs = RenderScript.create(context);
//Create an Intrinsic Blur Script using the Renderscript
ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
//Create the Allocations (in/out) with the Renderscript and the in/out bitmaps
Allocation allIn = Allocation.createFromBitmap
 
(rs, bitmap);
Allocation allOut = Allocation.createFromBitmap(rs, outBitmap);
//Set the radius of the blur: 0 < radius <= 25
blurScript.setRadius(12.0f);
//Perform the Renderscript
blurScript.setInput(allIn);
blurScript.forEach(allOut);
//Copy the final bitmap created by the out Allocation to the outBitmap
 
allOut.copyTo(outBitmap);
//recycle the original bitmap
bitmap.recycle();
//After finishing everything, we destroy the Renderscript.
rs.destroy();
    return outBitmap;
}

blurScript.setRadius(12.0f);//這個是設定模糊度，取值在0 < radius <= 25，值越大越模糊

既然是網路圖片，用url生成Bitmap的方法如下：

/**
 * @param urlpath
* @return Bitmap
 * 根據圖片url獲取圖片物件
 */
public static Bitmap getBitMBitmap(String urlpath) {
    Bitmap map = null;
    try {
        URL url = new URL(urlpath);
URLConnection conn = url.openConnection();
conn.connect();
InputStream in;
in = conn.getInputStream();
map = BitmapFactory.decodeStream(in);
// TODO Auto-generated catch block
} catch (IOException e) {
        e.printStackTrace();
}
    return map;
}

這個方法不能在UI執行緒中執行，又引出下面的部分，用Thread+Handler實現，程式碼如下：

Thread:

new Thread(new Runnable() {
    @Override
public void run() {
        Bitmap bitmap = Utils.getBitMBitmap(headerImageUrl);
Message msg = Message.obtain();
msg.what = 0;
msg.obj = bitmap;
handler.sendMessage(msg);
}
}).start();

Handler:

Handler handler = new Handler(){
    @Override
public void handleMessage(Message msg) {
        if(msg.what == 0){
            Bitmap newBitmap = Utils.blurBitmap((Bitmap) msg.obj ,getActivity());
iv_parent.setImageBitmap(newBitmap);
}
    }
};

完畢